Carbon-holder for arc lamps



Patented Feb. 9, 1892.7

Pfiwanfoff UNITED STATES PATENT OFFICE.

SAMUEL P. PARMLY, OF CHICAGO, ILLINOIS.

CARBON-HOLDER FOR ARC LAMPS.

SPECIFICATION forming part of Letters Patent No. 468,411, dated February9, 1892. Application filed September 30, 1890. Serial No. 866,627. (Nomodel.)

To all? whom it may concern:

Be it known that I, SAMUEL P. PARMLY, a citizen of the United States,residing at Chicago, in the county of Cook and State of Illinois, havein vented a new and usefullmprovement in Are Lamps and Carbon IloldersThcrefor, of which the following is a specification.

My invention relates to holders for carbons of arc lights, and hasreference particularly to such holders as are employed in the case ofarc lights with two or more upper carbons suspended from a single rod.

It is illustrated in the accompanying drawings, wherein- Figure 1 is afront view of a triple-carbon lamp, showing only the carbons inposition. Fig. 2 is a side view of same. Fig. 3 is a front view of theupper-carbon holder with the permanent clamp removed. Fig. 4 is acrosssection on the line 4 4, and Fig. 5 is a crosssection on line 5 5.

Like parts are indicated by same letter in all figures.

A is the upper-carbon rod, provided at its lower end with theenlargement B, preferably globular.

C O are the two upper carbons, adapted to be received into grooves D Din the body E of the holder. This body is provided with a side ledge F Fand middle rib G, between which said grooves are formed. They arepreferably made of flat surfaces, which meet each other at angles, butmight be are shape in cross-section to receive the cylindrical carbons,or might be made to conform to the shape of the carbons.

On the body E are provided the upwardlyprojected arms H II, inwardlycurved so as to engage the enlargement on the end of the rod. Securedupon the body on the standards J J is the temporary clamp K, composed ofthe lower spring clamping-plates L L and the upper curved overhangingclamping-plate M, which, together with the arms II II, secures the bodyof the holder to the enlargement on the rod. The temporary clamp K issecured on the body. The clamping-plates L L lie respectively over thegrooves D D. The permanent clamp N is provided with a lower projectionO, which lies above the springplates L L, and the upward projection oroverhanging arms P, which lie above the portion M of the temporary clampK. The permanent clamp is adj ust-ably secured in position by means ofthe screw-bolt R, which passes through both clamps and the body of theholder, and by the thumb-piece S, rigid on the end of such screw-rod andexterior to the permanent clamp.

The lower-carbon sheet is indicated by the letter T, and is preferablycomposed of the sections U and V, joined by bridge or web XV.

The use and operation of my invention are as follows: In applyingcarbons to lamps 6 5 where two carbons are used with the uppercarbonholder it will be seen that there is more difficulty in bringing the twocarbons in proper relation to each other and then in proper relation tothe lower carbon or carbons than where but a single is used above. Thesedifficulties are of considerable moment, since the lamps are used bypersons not particularly skilled in the manipulation of machincry, andthey are greatly overcome by the means exhibited in my drawings. By thedevices illustrated it is possible to suspend the upper carbons 011 theenlargement of the upper-carbon rod, so that they will have freedom ofmovement with reference to the axis of the upper-carbon rod, asindicatedin Figs.

2 and 3. Before bringing the parts into a permanent relation it isdesirable that the carbons should be capable of independent adjustment,which is accomplished by means of 8 5 the grooves and what I have calledthe temporary clamp K. It is also desirable that the relation betweenthe parts should be first fixed in a temporary manner or so as to admitof movement, the one upon the other, be fore they are permanentlysecured together. The carbons are pushed up into their respectivegrooves, where they are supported each in dependently by itsclamping-plate L. They may then be moved in their grooves. In the 5meantime the engagement of the upwardlycurved arms II if and N with theenlargement B will temporarily support the carbonholder and carbons uponthe rod, butin such manner as to permit of the free movement of theholder and carbons with reference to the rod. \Vhen the parts havefinallybeen brought into the proper position, the permanent clamp ofmetal is screwed down forcibly upon the various parts of the clamp K, soas to permanently fasten the carbons in their respective grooves and thecarbon-holder to the rod in the proper position. Thus it will be seenthat there is an independent support for both of the carbons, and thatthis support is of such a nature as to permit the movement of either;that the carbon-holder is supported upon the rod so as to be easilycapable of movement; that there are means for rigidly securing theholder to the rod and the carbons to the holder, and that there is adevice whereby the holder may be rigidly fixed to the rod and thecarbons be rigidly fixed to the holder by a single operation, so as tofix them at once in their relative positions.

The lower carbon, as hereinbefore illustrated, is of a sheet or strip ofmaterial of substantially the same diameter in one direction as theupper carbons and of substantially the same diameter in the otherdirection as the distance between the outer surfaces of the two uppercarbons.

joint, said holder provided with two chan- 4 nels and a thinseparating-rib, so as to receive two carbons side by side, a temporaryor spring clamp for each of the carbons, and a single permanent clampfor both of the car bons, so that either may be'independently ad- 3'usted, but both may be simultaneously locked in a fixed relation.

SAMUEL P. PARMLY.

Vitnesses: O. P. CHAPMAN, JEAN ELLIOTT.

